W=22-1/8"   L=53-3/4"   D=9"   B=11-1/16"    29 Gallon Tank

Use a hole saw to create holes for ABS fitting.  For 3" fitting use a 3 1/8" hole saw.  For 2" fitting use a 2 1/8" hole saw.  For 1 1/2" fitting use a 1 5/8" hole saw.  Use ABS cement to install fittings.  Repairs can be made with ABS cement.